The guide rails are made of ultra high molecular weight polyethylene. This is not the best choice of material. Yes, UHMW slides easily because it's a low-friction material. That seems smart at first glance. But it has too many flaws that make it a really bad choice of material, making any build with this kit totally frustrating and time consuming. Descent. Well, the cement doesn't hold up well on these bars. So you can't keep the rods glued to your table well. Mine has crashed a few times. When drilling holes in the bars, you have to be very careful, otherwise the plastic will melt (polyethylene melts easily). When you screw in the rods, sometimes the rods will be misaligned or not positioned straight, or the plastic will buckle from the pressure of the pan head screw, causing the guide to no longer slide easily on the guide. There were so many problems during my build. that halfway through I threw it away and got something better. There are better options.
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